Certified Rhythm Analysis Technician (CRAT) Practice Exam

Question: 1 / 400

If the PR interval measures 6 small squares on an ECG, what is the duration?

0.24 seconds

To understand why the duration of the PR interval that measures 6 small squares on an ECG is 0.24 seconds, it's important to know how the small squares are defined in terms of time.

Each small square on an ECG paper represents 0.04 seconds. Therefore, to calculate the duration of a PR interval that spans 6 small squares, you multiply the number of small squares (6) by the duration of each small square (0.04 seconds):

6 small squares × 0.04 seconds/small square = 0.24 seconds.

This calculation allows us to accurately interpret the length of the PR interval on the ECG. In clinical practice, the normal PR interval ranges from 0.12 to 0.20 seconds, so a measurement of 0.24 seconds indicates a longer interval, potentially suggesting an atrioventricular block, for instance.

Understanding the relationship between small squares and time in an ECG is crucial for accurately analyzing cardiac rhythms and diagnosing conditions.

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